Stabilized Optical Scanning Tunneling Microscopy: Probing Defect-Driven Phenomena in Correlated Electron Systems

Traeger, Georg

dc.contributor.advisor	Wenderoth, Martin apl. Prof. Dr.
dc.contributor.author	Traeger, Georg
dc.date.accessioned	2025-11-26T18:15:18Z
dc.date.issued	2025-11-26
dc.identifier.uri	http://resolver.sub.uni-goettingen.de/purl?ediss-11858/16365
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-11664
dc.format.extent	113	de
dc.language.iso	eng	de
dc.rights	Attribution-NonCommercial 4.0 International	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc/4.0/	*
dc.subject.ddc	530	de
dc.title	Stabilized Optical Scanning Tunneling Microscopy: Probing Defect-Driven Phenomena in Correlated Electron Systems	de
dc.type	doctoralThesis	de
dc.contributor.referee	Wenderoth, Martin apl. Prof. Dr.
dc.date.examination	2025-10-28	de
dc.subject.gok	Physik (PPN621336750)	de
dc.description.abstracteng	This thesis presents the development and application of a stabilized optical scanning tunneling microscopy (STM) approach that enables controlled, localized optical excitation at the atomic scale. A key advancement is the implementation of grating-coupled plasmonic gold tips combined with active beam stabilization via image recognition, which suppress long-term thermal drift and pointing instabilities that have historically limited optical STM experiments. This method allows surface plasmon polaritons to be launched remotely and adiabatically focused to the tip apex, providing nanometer-scale excitation without far-field illumination of the junction. The technique is applied to the correlated layered material 1T-TaS₂, a prototypical charge density wave (CDW) system exhibiting insulating, metallic, and metastable photo-induced states. Using low-temperature STM and scanning tunneling spectroscopy, we first identify a fully metallic anti-phase boundary embedded within the semiconducting commensurate CDW phase. Under controlled optical excitation, we observe the nucleation and manipulation of CDW domain structures and reveal a correlation between defect sites and the formation of domain wall networks. Additionally, we report the emergence of chiral domain configurations by optically quentching the sample system.	de
dc.contributor.coReferee	Weitz, Thomas Prof. Dr.
dc.subject.eng	Scanning Tunneling Microscopy	de
dc.subject.eng	Plasmonic Tip	de
dc.subject.eng	Correlated Electron Systems	de
dc.subject.eng	Charge Density Waves	de
dc.subject.eng	1T-TaS₂	de
dc.subject.eng	Non-Equilibrium Electronic States	de
dc.subject.eng	Domain Walls	de
dc.identifier.urn	urn:nbn:de:gbv:7-ediss-16365-4
dc.date.embargoed	2026-10-27
dc.affiliation.institute	Fakultät für Physik	de
dc.description.embargoed	2026-10-27	de
dc.identifier.ppn	1942652011
dc.notes.confirmationsent	Confirmation sent 2025-11-26T19:45:01	de

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